Event-Based Programming: Taking Events to the Limit by Ted Faison

By Ted Faison

Languages like C#, VB .NET, and Delphi comprise integrated aid for occasions, and those occasions turn into very strong once they attach the gadgets and elements of a procedure. occasions ensure that such components to have interaction with none coupling. And the ensuing elements should be constructed and confirmed separately which retains the code fresh and straightforward.

Component-based improvement (CBD) is an extension of object-oriented programming. CBD does away with the language and vendor-specific boundaries of OOP, makes software program reuse simpler and speeds up the improvement technique. Event-based programming is the following logical step in CBD, and makes parts extra reusable because of their decoupled nature. yet event-based platforms are more uncomplicated to advance, this means that they’re more cost-effective and extra trustworthy than conventional OOP or CBD structures.

This e-book teaches you the way to strengthen software program in line with elements that have interaction essentially via an occasion mechanism. You’ll tips on how to use occasions in lots of assorted events, to unravel ordinary improvement difficulties with no coupling. The ebook introduces sign Wiring Diagram, a singular kind of software program diagram just like the circuit diagrams utilized by designers. The e-book concludes with a sequence of case reviews, incorporating all featured techniques. In a nutshell, you’ll are looking to decide up a replica of this publication simply because it:

* exhibits the way to use an event-based paradigm to lessen or thoroughly do away with coupling among sessions and elements
* Describes elements, together with coordinators, employees, developers, binders, and routers
* includes 3 whole case experiences that version techniques getting used to layout small, medium, and big platforms

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Additional info for Event-Based Programming: Taking Events to the Limit

Sample text

A and B might be implemented in C# as shown in Listing 1-8. Listing 1-8. Two Classes That Have Literal Logic Coupling public class A { public void SendVehicleSoldMessage(byte[] theMessage) { const int MessageTypeIndex = 0; const byte VehicleSoldMessage = 15; theMessage[MessageTypeIndex] = VehicleSoldMessage; // ... write the rest of the message } } public class B { public void ProcessMessage(byte[] theMessage) { const int CommandCodeIndex = 0; const int CarSoldMessage = 15; byte commandCode = theMessage[CommandCodeIndex]; if (commandCode == CarSoldMessage) // ...

Listing 1-13. DoSomething(); } } public class B { public void DoSomething() { // ... } } Since A calls B’s constructor explicitly, B must be present both at compile time and run time, so class A is both statically and dynamically coupled to B. Class A doesn’t accept substitutes for class B, such as derived classes. To convert the UTC between A and B into ATC, you must change the design so that A accepts B or a derived class. There are two common strategies, both of which entail the use of a class builder, increasing somewhat the complexity of the system.

The pointer must be initialized before being used; otherwise, it will point to nothing. The code in the preceding listing uses a separate class called BuilderBinder to create instances of A and B. Method1. In the listing, the delegate is declared outside of all classes, at the namespace level. C# also allows delegates to be declared inside a class, without affecting the signature represented by the delegate. It is worth reiterating the fact that method references work at the object level, not the class level.

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